/*
* Authoer:JacksonCoder
* CreateTime:
* Version: 1.0.0
*/

const THREE_HOURS_IN_SECONDS: u32 = 60 * 60 * 60 * 3;
fn main() {
    println!("三小时的秒数:{}", THREE_HOURS_IN_SECONDS);

    let x = 3;
    let x = x + 1;

    {
        let x = x * 2;
        println!("内层 x 的值为:{}",x);
    }

    println!("外层 x 的值为:{}",x);
}
